The document discusses the metric system and scientific notation. It provides details on: - The metric system is based on prefixes that are powers of 10 combined with base units of meters, liters, and grams. - Conversions within the metric system involve moving the decimal place right or left based on moving to larger or smaller units. - Scientific notation expresses very large and small numbers in a standard form of a number between 1 and 9 times a power of 10.